diff --git a/configure.ac b/configure.ac
index caa0b9478e..df1ba41747 100644
--- a/configure.ac
+++ b/configure.ac
@@ -162,7 +162,7 @@ AC_TYPE_OFF_T
 AC_TYPE_PID_T
 AC_TYPE_SIZE_T
 AC_TYPE_UID_T
-// Taken from gettext
+# Taken from gettext
 AC_CACHE_CHECK([for wchar_t], [gt_cv_c_wchar_t],
    [AC_TRY_COMPILE([#include <stddef.h>
       wchar_t foo = (wchar_t)'\0';], ,